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Use of Field-Applied Fluoropolymer Coatings for Maintenance and Restoration Applications D+D Webinar Bob Parker (AGCCA) June 29, 2011 Field-applied Maintenance & Restoration Coatings Outline 1) Why are you considering recoating the structure? 2) Choice of Coating Type 3) Identification of Surfaces to be coated 4) Substrate Preparation 5) Application of Coating 1 Field-applied Maintenance & Restoration Coatings Why are you considering recoating the structure? Aesthetics 2 Protection of substrate Energy Savings Expansion / Remodeling Resale of Structure Field-applied Maintenance & Restoration Coatings Choice of Coating Type: 3 cost considerations substrate being coated previous coating used on structure length of future ownership (color scheme) experience of coating applicators exposure to sun and geographic location LEED certification (favor FEVE coatings) Field-applied Maintenance & Restoration Coatings LEED credits toward certification o “Leadership in Energy and Environmental Design” o created by U.S. Green Building Council (non-profit; founded in 1993) o LEED certification is voluntary o Benefits are measured in many ways: - increase in appeal of building to tenants (higher rents) - chance for tax credits - cost effective (new construction) - mitigate risks/lawsuits - competitive differentiator 4 Field-applied Maintenance & Restoration Coatings “LEED 2009 for Existing Buildings: Operations and Maintenance” - explains how to receive credit points toward certification Four categories found for possible credits for FEVE coatings: 1) Sustainable Sites SS Credit 2: Building Exterior & Hardscape Management Plan SS Credit 7.1: Heat Island Reduction – Non-Roof 2) Energy and Atmosphere EA Credit 1: Optimize Energy Efficiency Performance 3) Materials and Resources MR Credit 3: Sustainable Purchasing – Facility Alterations and Additions 4) Innovations and Operations IO Credit 1: Innovative Changes to Building (LEED-type goal) IO Credit 3: Documenting Sustainable Building Cost Impacts 5 Field-applied Maintenance & Restoration Coatings Identification of Surfaces to be coated: • Discussion will involve factory-coated materials • 3 step evaluation is suggested 1) Establish type of metal substrate 2) Identify the previous coating 3) Identify and correct any problem areas of the structure 6 Field-applied Maintenance & Restoration Coatings Types of metal that are factory-coated: 1) 2) 3) 4) 5) 6) 7) 8) 7 cold-rolled steel hot-dipped galvanized electrogalvanized zinc-steel aluminum stainless steel copper brass Field-applied Maintenance & Restoration Coatings Identification of Previous Coating PVDF coating vs. non-PVDF coating - will determine the proper procedure for surface preparation - adhesion to a fluoropolymer can be difficult - PVDF can be recoated providing: 1. It has reached a ripe old age 2. It is given the proper surface treatment 3. An approved primer is used 4. Primer passes ASTM D3359 adhesion test 8 Field-applied Maintenance & Restoration Coatings PVDF Coating – after 20 years of outdoor weathering (5000X magnification) 9 Field-applied Maintenance & Restoration Coatings Correction of Problem Areas Corrosion – simple or galvanic Water Drainage Problems – resulting in discoloration of the coated surfaces Water infiltration Poorly applied recoats or touchups 10 Field-applied Maintenance & Restoration Coatings Substrate Preparation – non-Ferrous SSPC–SP 16 “Brush-off Blast Cleaning of Coated and Uncoated Galvanized Steel, Stainless Steels, and NON-Ferrous metals” 11 SSPC SP-1 - removal of dirt, chalking, and oil deposits Brush-Blasting with wet or dry abrasive; closed cycle Recommended abrasive selection (size and type) depends on: a. type, grade, and surface condition of the substrate b. type of blast cleaning system c. finished surface to be produced d. abrasive to be recycled or not Second Cleaning per SSPC SP-1 Profile Minimum = 19 microns (0.75 mils); check with ASTM D 4417 or ASTM D 7127 Field-applied Maintenance & Restoration Coatings Substrate Preparation - Steel 1) SSPC–SP 6 “Commercial Blast Cleaning” 12 SSPC SP-1 - removal of dirt, chalking, and oil deposits Blasting Cleaning with wet or dry abrasive; closed cycle Recommended abrasive selection (size and type) depends on: a. type, grade, and surface condition of the substrate b. type of blast cleaning system c. finished surface to be produced d. abrasive to be recycled or not Second SSPC SP-1 Cleaning Field-applied Maintenance & Restoration Coatings Application of FEVE Coating: 1) FEVE Coating comparable to a Two-component Polyurethane Coating; available as a solvent-based system and a waterbased system 2) Can also be supplied as a one-component solvent-based coating or a one-component water-based coating 3) All coatings can be brush, rolled or sprayed 4) Follow the specific instruction from each manufacturer 5) Pot lives of 2K coatings decrease quickly as the air temperature increases: 5 hours @ 50° F. 1 hour @ 90° F. 6) All coatings available in a wide range of glosses 13 Field-applied Maintenance & Restoration Coatings Sunshine Weatherometer Exposure Testing (Carbon Arc) 110 Gloss retention (%) 100 90 80 70 60 LF200 coating 50 PVDF coating 40 Acrylic Urethane coating 30 20 10 0 0 500 1000 1500 2000 2500 3000 SWOM Exposure (hours) 14 3500 4000 4500 Field-applied Maintenance & Restoration Coatings EMMAQUA Testing (Outside Test Fence – Arizona) 110 Gloss retention (%) 100 90 80 70 FEVE coating 60 50 PVDF coating 40 Acrylic Urethane coating 30 20 10 0 0 400 800 1200 1600 2000 Radiant Energy (Mj/m²) 15 2400 2800 3200 Field-applied Maintenance & Restoration Coatings Conclusion: FEVE Coatings can be used as field-applied coatings over PVDF-based factory-applied finishes. Superior weathering performance can be obtained comparable to the PVDF finishes. Solar reflective coatings containing IR-reflective pigments can also be incorporated into an FEVE coating. 16